Vulnerability in Linux
CVE-2021-28688
The fix for XSA-365 includes initialization of pointers such that subsequent cleanup code wouldn't use uninitialized or stale values. This initialization went too far and may under certain conditions also overwrite pointers which are in need of cleaning up. The lack of cleanup would result in leaking persistent grants. The leak in turn would prevent fully cleaning up after a respective guest has died, leaving around zombie domains. All Linux versions having the fix for XSA-365 applied are vulnerable. XSA-365 was classified to affect versions back to at least 3.11.
Vulnerability class: Dirty Pipe (CVE-2022-0847)
EPSS: 0.003 (25.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H.
Affected products
- Linux — versions unspecified, 3.11, next of 4.3
- Linux Linux_kernel
- Debian Debian_linux — versions 9.0
Weakness classification (CWE)
References
- security@xen.org (Patch, Third Party Advisory, x_refsource_MISC)
- security@xen.org (mailing-list, x_refsource_MLIST, Third Party Advisory)
- security@xen.org (mailing-list, x_refsource_MLIST, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-28688?
- CVE-2021-28688 is a medium-severity vulnerability in Linux, classified under Improper Initialization. CVSS score: 6.5/10. Published 2021-04-06.
- How severe is CVE-2021-28688?
- Medium severity. CVSS v3 base score is 6.5 out of 10.